How to add a laundry drain to existing wall

I'm sure there's a simple answer, but for the life of me, I can't figure this out.

Converting my garage into an additional living space. Adding concrete to the garage to level it out with the existing home with all new drains under the concrete.

Adding a laundry room to the corner of the existing garage. When I route down the washing machine drain to the bottom plate, how do I get it routed beneath the concrete slab? It's not like I'm building this new wall over the new concrete floor which I could plumb the drain up from.

Normally, when you build a home on a slab, you lay your plumbing and then pour the concrete. Some of the plumbing drains come up through your bottom plate and into the walls between the studs.

I'm adding a laundry room to an existing wall that doesn't have any drains to tie into. My closest drain would be in the adjacent room. Therefore, the drain I'm going to be putting into the laundry room will be run under the slab.

How do I plumb the drain from the concrete floor up into the wall for the washing machine?